JPH0620896Y2 - Dustproof seal for linear guide device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to improvement of a dustproof seal in a linear guide device.

[Conventional technology]

Generally, a linear guide device includes a guide rail 1 extending in the axial direction as shown in FIG. 7, and a slider 2 movably supported on the guide rail 1. Ball rolling grooves 3 are formed on both outer side surfaces of the guide rail 1 in the axial direction.
In the slider body 2A, ball rolling grooves (not shown) that face the ball rolling grooves 3 are formed on the inner surfaces of both sleeve portions 4, respectively. A large number of balls are rotatably loaded between the ball rolling grooves facing each other so that the slider 2 can move axially on the guide rail 1 through the rolling of the balls. Has become. With this movement, the balls interposed between the guide rail 1 and the slider 2 roll and roll on the slider body 2A of the slider 2.
To the end of. These balls must be circulated in order to continuously move the slider 2 in the axial direction. Therefore, a through hole (not shown) as a ball passage further penetrating in the axial direction is further formed in the sleeve portion 4 of the slider body 2A, and end caps 5 are provided at both front and rear ends of the slider body 2A. A ball circulation path is formed by forming a U-shaped curved ball circulation path that connects the ball rolling groove and the through hole as a ball passage.

Reference numeral 6 is a recess formed on the upper surface of the guide rail 1 over the entire length of the rail, and 6A is an insertion hole for a mounting bolt to be mounted on a base (not shown). This bolt insertion hole 6
A large number of A are provided at predetermined intervals in the axial direction of the guide rail 1. 6B is an outer edge of both ends of the opening of the bolt insertion hole 6A, and is a flat surface portion extending in the axial direction on the upper surface of the guide rail 1.

Of the guide rail 1, the ball rolling groove 3 and the recessed line 6 in the portion where the slider 2 slides are free of dust, dust, and the like (hereinafter,
It is customary to attach a dustproof seal 10 to the end cap 5 since it accumulates as foreign matter and hinders smooth rolling of the ball.

By the way, as the conventional dustproof seal 10, for example, the seventh
The applicant has previously proposed what is shown in FIG. 8 to FIG. 8 (Japanese Utility Model Publication No. 60-103623). This is composed of a metal plate 7 which is attached to the end surface of the end cap 5 with the back surface side and fixed by a machine screw 11, and a rubber body 8 adhered to the entire front surface side of the metal plate 7. A passage opening 9 for the guide rail 1 is provided at the center, and the whole is formed in a substantially U shape. The inner edge of the passage opening formed in the metal plate 7 is simply linear, while the inner edge of the passage opening formed in the rubber body 8 adhered thereto has a ball rolling groove 3 of the guide rail 1. A semi-circular seal projection 8a corresponding to the above and a trapezoidal seal projection 8c corresponding to the recessed line 6 are projected.

A lip having an acute angle is formed at the tip of each of the seal projections 8a and 8c, and the lip scrapes foreign matter while slidingly contacting the outer surface of the guide rail 1 including the ball rolling groove 3 and the recess 6 of the guide rail 1. The inside of the slider 2 is protected against dust.

Reference numeral 13 is a nipple that supplies a lubricant to the ball circulation path.

[Problems to be solved by the invention]

In such a conventional dust-proof seal for a linear guide device, a seal member formed according to the cross-sectional shape of the guide rail has a structure in which foreign matter adhering to the rail side surface or the top surface is wiped and removed. Therefore, the following problems have occurred.

On the upper surface of the guide rail 1 is a mounting bolt insertion hole 6A.
Is open, and the bolt is inserted into it, so it is a depression. It is impossible to completely wipe off the foreign matter accumulated in the recess by the trapezoidal seal projection 8c of the dustproof seal 10, and if the foreign matter that has passed through the seal projection 8c scatters inside the slider 2, the ball circulation path can be easily carried out. And the dustproof function is impaired.

The stronger the pressure is applied to the seal lip in order to increase the dustproof function, the more the pressure difference between the seal surface pressure when the trapezoidal seal projection 8c passes through the recess of the bolt insertion hole 6A and when it passes through the flat surface between the recesses is the resistance. And the running function of the slider 2 deteriorates.

Also, unless the chamfering of the bolt insertion hole is performed very well, the lip of the trapezoidal seal protrusion 8c of the dustproof seal 10 is caught, which causes resistance and shortens the life of the dustproof seal 10.

Therefore, the present invention provides a dust-proof seal for a linear guide device having a structure in which foreign matter accumulated on the upper surface of the guide rail, particularly in the bolt insertion hole portion, is allowed to pass through the slider without being wiped and does not enter the ball circulation path. This aims to solve the above-mentioned conventional problems.

[Means for solving problems]

The present invention, which achieves the above-mentioned object, has a bolt insertion hole for fixing to a base, and a guide rail that has axial ball rolling grooves on both sides and is extended in the axial direction, and the guide rail. It has a ball rolling groove facing the ball rolling groove of the rail, and is supported by the guide rail so as to be movable in the axial direction through rolling of a large number of balls inserted in these ball rolling grooves. A dust-proof seal of a linear guide device including a slider, wherein the slider body faces two flat surface portions formed axially extending on the upper surfaces of both sides of the opening of the bolt insertion hole of the guide rail. The inner seal member is provided with an inner seal member that is axially extended and fixed over the entire length of the ball row of the slider body.

[Action]

Foreign matter attached to the upper surface of the guide rail passes through the inside of the slider. Even if the foreign matter passing therethrough scatters inside the slider, the inner seal member attached to the inner surface of the slider prevents the foreign matter from entering the ball rolling groove.

Therefore, it is possible to effectively prevent the phenomenon that the sealing performance is deteriorated due to the mounting bolt insertion hole of the guide rail, the life of the seal is shortened, and the traveling function of the slider is deteriorated due to the fluctuation of the seal resistance.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

1 to 6 show an embodiment of the present invention. In the figure, the same or corresponding parts as those of the conventional one are designated by the same reference numerals, and detailed description thereof will be omitted.

As the dustproof seal 20, there is a side seal member 21 screwed to the end faces of the end caps 5 attached to both ends of the slider body 2A with machine screws 11. The side seal members 21 are formed on the both sides of the guide rail 2 in two rows, and each has a ball rolling groove 3A having a substantially semicircular cross section.
3B has a semi-circular seal protrusion 8a similar to the conventional one that is slidably contacted and wiped. However, there is no trapezoidal seal projection 8c that has been conventionally formed at a position corresponding to the recessed ridge 6 where the bolt insertion hole 6A is opened on the upper surface of the guide rail 1. A notch 23 is formed so that a gap 24 as a foreign matter passage space is formed between the notch 23 and the surface of the recess 6 of the guide rail 1.

As the dustproof seal 20, the side seal member 2 is further used.
1 is mounted on the inner surface side of the slider main body 2A in parallel with the ball row, and the flat portion 6B on the upper surface of the guide rail 1
There is an inner seal member 25 that seals between

This inner seal member 25 is a bolt insertion hole 6A on the upper surface of the guide rail 1 on the inner surface of the slider body 2A having a U-shaped cross section, and the surface 2b facing the upper surface of the guide rail 1.
It is attached by being directly fixed by extending in the axial direction over the entire length of the ball row of the slider body 2A so as to correspond to the two flat surface portions 6B formed on both sides of the opening in the axial direction. This fixing means may be any fixing means such as an adhesive, a screw, or a combination of both, but when a screw is used, when the screw head projects downward, the flat surface portion 6 of the guide rail 1 is used.
Since B is damaged, a flat head screw 26 is used to prevent the screw head from protruding.

The function of the inner seal member 25 is to prevent foreign matter that has passed through the gap 24 formed by the notch 23 of the side seal member 21 from entering the ball circulation path, and can fulfill this function. As long as it is a material, the material may be any of metal, plastic, synthetic rubber, etc., and it is not particularly limited.

The inner seal member 25 has a plate-like shape that is long in the axial direction as a whole, but various modifications can be applied to its cross-sectional shape, for example, as shown in FIGS. 4 to 6.

That is, the one shown in FIG. 4 has a rectangular cross section, and the lower surface thereof and the flat surface portion 6B of the upper surface of the guide rail are not in contact with each other, and a very small gap C is left therebetween. This prevents wear of the inner seal member 25.

Further, in FIG. 5, both outer edge portions 25A in the longitudinal direction of the inner seal member 25 are projected and brought into contact with the flat surface portion 6B of the guide rail 1. Surface contact in the longitudinal direction of the guide rail 1 is shown in FIG. And the sealing effect is enhanced.

In FIG. 6, a plurality of tapered projections 2 in a labyrinth seal shape parallel to the longitudinal direction are provided on the lower surface of the inner seal member 25.
5B is formed, and the tip portion thereof is formed into the flat surface portion 6 of the guide rail 1.
B is in contact with B, and line contact is made in the longitudinal direction of the guide rail 1 to enhance the sealing effect.

In addition, for example, instead of forming a straight line in the longitudinal direction on the lower surface of the inner seal member 25, a protrusion curved toward the rail recess 6 in a bow shape is formed, or a trapezoidal cross section is formed. Various modifications are conceivable.

A plate-shaped inner seal member 25 that is long in the axial direction as a whole
The length is the same as the axial length of the slider 2, and its end is adapted to the end of the side seal member 21 as shown in FIG.

Here, the ball circulation path is the same as in the conventional case, and the ball rolling grooves 3A and 3B of the guide rail 1 and the ball rolling grooves 30A and 30B formed on the inner surface of the slider body 2A so as to be opposed thereto, Through holes 31A and 31B formed in the thick portion of the sleeve portion 4 of the slider body 2A as ball passages parallel to these ball rolling grooves, and these ball rolling grooves 3A, 3B, 30A and 30B and balls. Passage 3
It is formed by a U-shaped curved ball circulation path (not shown) formed in the end cap 5 so that the 1A and 31B communicate with each other.

Further, 3a is an escape groove for the cage W formed in the groove bottoms of the ball rolling grooves 3A and 3B of the guide rail 1, and 15 is a lower seal.

Next, the operation of the dustproof seal 20 having the above configuration will be described.

The side seal member 21 as the dustproof seal 20 is attached to the end face of the end cap 5 joined to the end face of the slider body 2A as in the conventional case, and the semi-circular seal projection 8a has a ball on the side surface of the guide rail 1. Rolling groove 3
The foreign matter attached to A and 3B is wiped and removed.

On the other hand, the foreign matter adhering to the upper surface of the guide rail 1, particularly the recessed strip 6, passes through the notch 23 of the side seal member 21 and passes inside the slider. That is, conventionally, the tips of the trapezoidal projections 8c are in line contact with each other across the surface of the recessed ridge 6, and foreign matter adhering to the recessed ridge 6 is moved by the relative movement of the slider 2.
While the trapezoidal projection 8c flicks away and eliminates it, it does not forcibly eliminate it and allows it to pass through.

Even if the foreign matter passing therethrough scatters inside the slider 2, the inner seal member 25 attached to the slider inner surface 2B causes the ball rolling grooves 3A, 30A, 3B, 30 to move.
B, and eventually foreign matter is prevented from entering the entire ball circulation path.

Therefore, conventionally, the foreign matter adhered to the recessed strip 6 etc.
If you break through the seal line due to the line contact of the trapezoidal protrusion 8c,
Although the ball rolling grooves 3A, 30A, 3B, 30B can be almost freely reached, the dustproof seal 2 of this embodiment is provided.
With 0, the inner seal member 25 makes a surface or line contact in the rail longitudinal direction and seals, and the sealing effect is much higher than in the conventional case.

Furthermore, the seal is caught in the mounting bolt insertion hole 6A of the guide rail 1 and is damaged, and the sealing performance is deteriorated.
The seal life is unlikely to decrease, and
All of the phenomena that the traveling function of the slider is deteriorated due to the fluctuation of the seal resistance can be effectively prevented.

[Effect of device]

As described above, according to the present invention, the seal projection that is in sliding contact with the upper surface of the guide rail in the conventional dustproof seal is removed, and the foreign matter adhering to the upper surface of the guide rail is allowed to pass through the slider as it is. An inner seal member that prevents foreign matter from entering the ball rolling groove is directly fixed to the inner surface of the slider that faces the upper surface of the rail. Therefore, the seal projection is not caught in the bolt insertion hole that opens on the upper surface of the guide rail, and the sealing function is reduced and the seal life is shortened due to the bolt insertion hole.
In addition, it is possible to prevent all the phenomena that the traveling function of the slider is deteriorated due to the fluctuation of the seal resistance.
Moreover, since the inner seal member attached to the inner surface of the slider prevents foreign matter from entering the ball rolling groove in the longitudinal direction at the side edge portion of the upper surface of the guide rail 1, the effect of improving the sealing performance can be obtained. To be

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a perspective view of a side seal member of the dustproof seal, and FIG. 3 is a front view of the end cap shown in FIG. FIG. 4, FIG. 5, FIG. 5, and FIG. 6 are cross-sectional views showing modified examples of the inner seal member, and FIG. 7 is a perspective view of a conventional linear guide device to which a dustproof seal is attached.
FIG. 8 is a perspective view of a conventional dustproof seal. In the figure, 1 is a guide rail, 2 is a slider, 2A is a slider body, 3 is a ball rolling groove (of a guide rail), 5 is an end cap, 6A is a bolt insertion hole, 6B is a flat surface portion, 8a is a seal projection, 13 is a nipple, 10 and 20 are dustproof seals, 21 is a side seal member, 23 is a notch, and 25 is an inner seal member.

Claims (1)

[Scope of utility model registration request] 1. A guide rail which has a bolt insertion hole for fixing it to a base and has axial ball rolling grooves on both side surfaces and extends in the axial direction, and a ball rolling of the guide rail. A slider having a ball rolling groove facing the groove and axially movably supported by the guide rail through rolling of a large number of balls inserted in these ball rolling grooves. A dust-proof seal for a linear guide device, wherein a slider is provided on an inner surface of the slider body, which opposes two flat surface portions formed axially on both upper surfaces of the openings of the bolt insertion holes of the guide rail. A dust-proof seal for a linear guide device, comprising an inner seal member that extends and is fixed in the axial direction over the entire length of the ball row of the main body.